51918664322 has 18 divisors (see below), whose sum is σ = 90596707497. Its totient is φ = 22249889424.

The previous prime is 51918664321. The next prime is 51918664327. The reversal of 51918664322 is 22346681915.

It can be written as a sum of positive squares in 2 ways, for example, as 51874162081 + 44502241 = 227759^2 + 6671^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=161119.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51918664321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2244158 + ... + 2267174.

Almost surely, 2^51918664322 is an apocalyptic number.

51918664322 is a deficient number, since it is larger than the sum of its proper divisors (38678043175).

51918664322 is an frugal number, since it uses more digits than its factorization.

51918664322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46050 (or 23026 counting only the distinct ones).

The product of its digits is 622080, while the sum is 47.

The spelling of 51918664322 in words is "fifty-one billion, nine hundred eighteen million, six hundred sixty-four thousand, three hundred twenty-two".